Shrinkage-gage



UNITED STATES PATENT OFFICE,

HENRY J. SMALL AND JAMES MONAUGHTON, OF BRAINERD, MINNESOTA.

SHRlNKAGE-GAGE.

SPECIFICATION forming part of Letters Patent No. 367,454, dated. August 2, 1887.

Application filed May 7, 1887. Serial No. 237,481. (No model.)

To all whom it may concern:

Be itknown that we, HENRY J. SMALL and JAMES MoNAUGH'roN, both of Brainerd, in the county of Grow WVing and State of Minnesota, have 'jointly invented a certain new and useful Improvementin Shrinkage-Gages, of which improvement the following is a specification. The object of ourinvention is to provide an instrument of simple and inexpensive construction, whereby the boring of locomotivewheel tires or other annular bands of metal designed to be fitted closely upon centers or bodies of cylindrical surface by being shrunk thereon may be accurately and uniformly regulated to' desired and determined degrees of allowance for shrinkage.

To this end our invention, generally stated, consists in the combination, with a tubular body, of a fixed stop, a pair of bars or spindles secured adjustably to the ends of the body, and a pair of removable gage-blocks, each adapted to fit between the fixed stop and one of the end spindles.

The improvement claimed is hereinafter more fully set forth.

In the accompanying drawings, Figure 1 is a side view in elevation of a shrinkage-gage embodying ourinvention; Fig. 2,alongitudinal central section, on an enlarged scale, through the same at and adjoining the right-hand end of Fig. 1; Fig. 3, a similar section at and adjoining the left-hand end of Fig. 1; Fig. 4, a side view, in elevation and on a similar scale, of the smaller gage-piece, and Fig. 5 an end view of the same.

In the practice of our invention we provide a hollow or tubular body, 1, which is preferably cylindrical and formed of weldless steel tubing, and is provided with screw-threads 2 3 at and near its ends for the engagement of clamping-nuts, to be presently described. A bar or spindle, 4, which is tapered to a blunt or rounded point on its outer end, is fitted freely in the bore of the body at one of its ends, which is conical or tapered on its periphery and divided by two or morelongitndinal slots, 5. The spindle 4 is secured firmly in any desired longitudinal adjustment in the body by a clamping-nut, 6, which engages the screw-thread 3 of the body, and is inwardly tapered correspondingly with the taper of the end of the body, in order to exert a clamping action thereon when screwed up to a tight bearing.

A fixed stop, 7, is secured in any suitable manner, as by a rivet, 8, in the bore of the body at some distance from its opposite end, and serves as an abutment for the inner end of one or the other of two or more cylindrical metallic gage-blocks, 9 10, which are adapted to fit freely in the body, one of said blocks, 9, which may be termed theprin1e-n1easure block, being of a determined length, as, say, one inch, and the other, 10, which may be termed the shrinkage-block, being made shorter than the first by a distance exactly equal to the amount of shrinkage which it is desired to allow in the tire or other article to be bored, as, say, of a length of sixty-one sixtyfourths of an inch, to give three sixty-fourths of-aninch allowance, which is usual fora tire designed for a fifty-six center. Additional shrinkage-blocks, each shorter than the block 9, are provided for different diameters required to be bored, the amount of shrinkage increasing in a given ratio with the diameter.

A bar or spindle, 11., pointed similarly to the spindle 4, is adapted to fit freely in the body 1, exterior to either of the gage-blocks which may be inserted therein, and is drawn and held tightly to abearing against the outer end of said block byaelamping-nut, 12, which engages the screw-thread 2 of the body and bears against a collar, 18, on the spindle.

In the operation of the gage theprime-ineasure block 9 is first insterted in the body, and the spindle 11 secured tightly against it by the clamping-nut 12. The spindle 4 is then inserted and adjusted, and held by the clamp ing-nnt 6 in such position longitudinally in the body that the distance from its point to that of the spindle 11 shall be exactly equal to the diameter of the center on which the article to be bored is required to be shrunk. The spindle 11 is then detached, the priniemeasure block withdrawn, and aselectcd shrinle age-block of the length proper to accord with the desired allowance for shrinkage substituted, and the spindle 11 replaced and screwed fast against the shrinkage-block. The entire length of the gage from point to point of the spindles will then accurately correspond with the diameter to which the tire or other article is to be bored.

The employment of our improvement insures the attainment of a uniform degree of shrinkage, such as may be prescribed as standard, in all tires for centers of the same diameter, and insures proper fitting by substituting the regulation of an accurate gage for the discretion of the workman in boring out tires of different diameters, with the further advantage that by providing a sufficient number of properly-proportioned shrinkage-blocks a single gage will serve for various diameters, as from time to time required.

We claim as our invention and desire to secure by Letters Patent 1. The combination, with a gage which is variable in length, of a prime-measure gageblock of determined length and one or more shrinkage-blocks of shorter length, substair tially as set forth.

2. The combination, in a shrinkage-gage, of abody, a pair of end bars or spindles connected adjustably thereto, a fixed stop, and two or more gage-blocks of different lengths respectively, and each adapted to be interposed between the fixed stop and one of the bars or spindles, substantially as set forth.

8. The combination, in ashrinkage-gage, of a tubular body having external screw-threads at and adjoining its ends, a pair of pointed spindles fitting freely in the bore of the body, clamping-nuts engaging thescrew-threads of the body and bearing on the spindles, a stop fixed in the body, a prime-measure gage-block of determined length, and a shrinkage-block of shorter length, either of which is suited to be interposed and held between the fixed stop and one of the spindles, substantially as set forth.

HENRY J. SMALL. J AMES MONAUGHTON.

\Vitnesses:

W. P. SPALDING, B. M. DE LAMBERT. 

